Developers over SiriPort have re-written the SiriPort to add stability and to make the server more responsive. They have just released SiriPort (Original) 5.1.1-3 which allows you to run Siri digital assistant on iPhone 4, iPhone 3GS, iPod Touch 4G and iPod touch 3G running jailbroken iOS 5.1.1. SiriPort (Original) 5.1.1-2 is no longer supported and past versions of the same will no longer be supported by a certificate 1.crt. A new certificate file has been made available which users must install for clean installation.
This is probably the only way (rather best) to install Siri on 5.1.1 and all other un-official Siri ports which use Spire Tweak have gone dead due to the fact that Apple does not host a decrypted copy of Siri for iOS 5.1. SiriPort (Original) 5.1.1-3 doesn’t require proxy server or iPhone 4S in hand.
The process for installing Siri is simple and straightforward. If you want to try this method, see the step by step guide below.
SiriPort (Original) 5.1.1-3 Installation Instructions
Step 2: Add the repository http://repo.siriport.ru
Step 3: Install a package SiriPort (Original) 5.1.1-3
Step 4: Install the certificate by visiting http://siriport.ru/siriport_ru_original.pem
Step 5: Reboot your iOS device
Step 6: Activate Siri and say “Hi Siri” Siri won’t work, wait 20 minutes and try again. (Say “Hi Siri”)
Step 7: Repeat step 6 until Siri is activated
Let us know in comments, if it works for you or not. Follow @JAlLBREAKS for more on Siri port.